I don't know how to relate those numbers, it's obviously not percentages...
All values are in ppm...which is standard for most soil tests.
Just for fun, I have also run soil tests on my household compost. It is about 60% kitchen waste and about 30% garden plant matter and another 10% or so cow compost. Again, all values are ppm. And again, No N, P, K required.
My cow compost comes directly from my cows and soil...never ever from a box store. I feed cows hay in winter and where I feed afterwards, I blade up the residuals into a large pile(s) of manure, urine, and some topsoil. I then compost it for several months before applying to the garden.
First photo below is soil test in ppm for my household compost and second photo is typical pile of my homemade "compost" from the cattle feeding.
| Nutrient | Your Results | Optimal Range | Rating |
|---|
| pH | 6.94 | 5.8-7.0 | Optimal |
| Total Nitrogen (N) | 34.97 | 32.0-60.0 | Optimal |
| Nitrate (NO3-N) | 32.89 | - | - |
| Ammonium (NH4-N) | 2.08 | - | - |
| Phosphorus (P) | 62.33 | 8.0-20.0 | High |
| Potassium (K) | 122.29 | 38.0-80.0 | High |
| Sulfur (S) | 11.51 | 7.0-22.0 | Optimal |
| Calcium (Ca) | 428.59 | 80.0-320.0 | High |
| Magnesium (Mg) | 37.81 | 27.0-70.0 | Optimal |
| Sodium (Na) | 23.93 | 0.5-30.0 | Optimal |
| Iron (Fe) | 1.15 | 3.0-10.0 | Low |
| Manganese (Mn) | 6.44 | 4.0-10.0 | Optimal |
| Zinc (Zn) | 1.02 | 0.1-0.25 | High |
| Copper (Cu) | 0.1 | 0.06-0.3 | Optimal |
| Boron (B) | 0.05 | 0.2-0.6 | Low |
Notice the significant presence of plant matter...it is not just cow manure...
My entire point can be summed up as
not all compost is alike...it depends on what materials have gone into the compost. Clearly, some compost (mine for example), contain near optimal values of N, P. K as well as other micro elements.
Other compost, e.g. leaf matter, may not contain any significantly measurable values of the necessary elements for growing veggies.
